公开(公告)号：US20080203995A1

公开(公告)日：2008-08-28

申请号：US12150458

申请日：2008-04-28

申请人： David A. Carrier ,  Bhanuprasad V. Gorti ,  Danh Thanh Trinh ,  R. Roby Bailey ,  Andrew E. Seman ,  Daniele C. Brotto ,  Fred S. Watts

发明人： David A. Carrier ,  Bhanuprasad V. Gorti ,  Danh Thanh Trinh ,  R. Roby Bailey ,  Andrew E. Seman ,  Daniele C. Brotto ,  Fred S. Watts

IPC分类号： H02M3/156 ,  H02J7/00

CPC分类号： H01M10/46 ,  B25F5/00 ,  H01M2/1022 ,  H01M10/0525 ,  H01M10/425 ,  H01M10/482 ,  H02J7/0065 ,  H02J2007/0039 ,  H02J2007/0067 ,  H02J2007/0098

摘要： In a cordless power tool system, a battery pack which may removably attachable to a cordless power tool and to a charger may include at least one battery cell and a power limiting device. The power limiting device may be arranged in series with the at least one battery cell for limiting power output of the battery pack based on the component that is connected to the pack. Current and hence power out of the battery pack may be controlled as a function of total internal impedance in the battery pack, which may be adjusted depending on the component that is connected to the pack.

摘要翻译： 在无绳电动工具系统中，可移除地附接到无绳电动工具和充电器的电池组可以包括至少一个电池单元和功率限制装置。 功率限制装置可以与至少一个电池单元串联布置，用于基于连接到包装的部件来限制电池组的功率输出。 可以根据电池组中的总体内部阻抗来控制电池组的电流和功率，这可以根据连接到组件的组件进行调节。

公开(公告)号：US07075257B2

公开(公告)日：2006-07-11

申请号：US10972964

申请日：2004-10-22

申请人： David A. Carrier ,  Bhanuprasad V. Gorti

发明人： David A. Carrier ,  Bhanuprasad V. Gorti

IPC分类号： H02P3/12

CPC分类号： H02P3/12

摘要： A method and apparatus for braking a motor has a braking circuit that intermittently shorts the windings of the motor to brake the motor. The braking circuit is powered by back EMF generated by the motor when power is disconnected from the motor.

摘要翻译： 用于制动电动机的方法和装置具有间歇地短路电动机的绕组以制动电动机的制动电路。 当电源从电机断开时，制动电路由电机产生的反电动势供电。

公开(公告)号：US07058291B2

公开(公告)日：2006-06-06

申请号：US09755330

申请日：2001-01-05

申请人： J. Michael Weaver ,  Aris C. Cleanthous ,  Christopher R. Yahnker ,  Bhanuprasad V. Gorti ,  Richard T. Walter

发明人： J. Michael Weaver ,  Aris C. Cleanthous ,  Christopher R. Yahnker ,  Bhanuprasad V. Gorti ,  Richard T. Walter

IPC分类号： H02P6/00

CPC分类号： H02K1/28 ,  H02K3/47 ,  H02K5/124 ,  H02K5/15 ,  H02K5/161 ,  H02K7/083 ,  H02K9/06 ,  H02K15/00 ,  H02K15/02 ,  H02K15/12 ,  H02K21/14 ,  H02K29/08 ,  H02P6/21 ,  Y10S388/937

摘要： A system and method for reducing the cost of producing a brushless DC motor (58) is presented. The brushless DC motor (58) provides higher power density and efficiency with an increased tool run time. The brushless DC motor (58) includes a rotor assembly (72) that has an unmagnetized permanent magnet (74) affixed to a shaft. The permanent magnet (74) remains unmagnetized until the motor is partially assembled. A plurality of coils (94) for producing a magnetic field are wound about the rotor assembly (72). The coils (94) include end turns that enclose the rotor assembly (72) such that the rotor assembly (72) is not removable. Since the windings (94) are wound with the rotor assembly (72) already enclosed, the windings (94) do not require large end coils to allow subsequent insertion of the rotor (72). Minimizing the end coils reduces the length of wire required per turn, thereby reducing the resistance of the winding (94). Also, since the permanent magnet (74) is unmagnetized when the coils (94) are wound around the rotor assembly (72) the winding process is simplified by not coupling energy into the wire which would influence the winder operation. The wound assembly is inserted into a stator stack (96) comprised of magnetic material that provides a magnetic flux return path for the magnetic flux generated by the permanent magnet (74). Using an unmagnetized permanent magnet (74) facilitates easy insertion of the wound assembly into the stator stack (96), reduces the accumulation of magnetic debris during the manufacturing process, and permits the motor assembly to be sealed prior to magnetizing the permanent magnet (74).

摘要翻译： 提出了一种用于降低生产无刷直流电动机（58）的成本的系统和方法。 无刷直流电动机（58）通过增加的工具运行时间提供更高的功率密度和效率。 无刷直流电动机（58）包括具有固定在轴上的非磁化永磁体（74）的转子组件（72）。 永磁体（74）保持不磁化，直到电机部分组装为止。 用于产生磁场的多个线圈（94）缠绕在转子组件（72）上。 线圈（94）包括围绕转子组件（72）的端匝，使得转子组件（72）不可拆卸。 由于绕组（94）与已经封闭的转子组件（72）缠绕，绕组（94）不需要大的端部线圈以允许转子（72）的后续插入。 使端部线圈最小化可减少每圈所需的导线长度，从而降低绕组（94）的电阻。 此外，由于当绕组（94）卷绕在转子组件（72）上时永磁体（74）不被磁化，所以通过不将能量耦合到将影响络纱机操作的导线中来简化卷绕过程。 卷绕组件被插入到由磁性材料构成的定子叠层（96）中，该磁性材料为由永磁体（74）产生的磁通提供磁通返回路径。 使用非磁化永磁体（74）有助于将缠绕组件容易地插入定子堆（96）中，减少制造过程中磁碎屑的累积，并允许电动机组件在磁化永磁体（74）之前被密封 ）。